Apparatus for feeding, severing, stripping, and bending hooked wire leads



2,571,078 AND APPARATUS FOR FEEDING, SEVERING, STRIPPING,

BENDING HOOKED WIRE LEADS 7 Sheets-Sheet 1 Filed Au A 5, 194a J. VOLLMER2,571,078 APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND

' BENDING HOOKED WIRE LEADS 7 Sheets-Sheet 2 Oct. '9 1951 Filed Aug. 6,194a 3nnentor fly4 1 A (Ittomegs Oct. 9, 1951 12,571,078

J. VOLLMER APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND

V BENDING HOOKED WIRE LEADS Filed Aug. 6, 1948 7 Sheets-Sheet 5 l I IBnventor J. VOLLMER APPARATUS FOR FEEDING, 'SEVERING, STRIPPING,-BENDING HOOKED WIRE LEADS Oct. 9, 1951 Filed Aug. 6 .1948

7 Shee ts-Sheet 4 3nventor 8 7 0 1 7 2D N A m b I P. P. u s w w E L REEm. MW um ow V Filed Aug. 6, 19 18 '7 Sheets-Sheet 5 Oct. 9, 19512,571,078

' J. VOLLMER APPARATUS FOR FEEDING, SEVERING, STRIPPING, AND- BENDINGHOOKED WIRE LEADS Filed Aug. 6, 1948 7 Sheets-Sheet 7 m6 I46 I 3nventotPatented Oct. 9, 1951 HE!) STATES PATENT ()FF-ICE APPARATUS FOR FEEDING,SEVERING, STRIPPING, AND BENDING HOOKED WIRE LEADS 19 Claims.

This invention relates to a device for bendin anend of a wire lead forelectrical devices, and more particularly to a device operating with andas a part of a machin which automatically cuts these leads to length andstrips a certain amount of insulation from the opposite ends of the cutlengths in preparation for making the electrical connections of theseleads in electrical devices, such, for example, as electricaldry shaversand other electrical devices.

It has for an object to provide a device which will operateautomatically with the lead cutting and stripping device to bend one endof the stripped wire or lead to form a hook, or a complete loop or eye,to facilitate making the electrical connection of the leads in theseelectrical devices, and to do this bending automatically in conjunctionwith and operated by and as a part of the cutting-off and strippingmachine, so that as the leads leave this machine they are complete andready for assembling and connecting them in the electrical device.

A further object is to provide a device of this character which may beassembled and applied to lead wire cutting and stripping machinesalready installed, and which will use motions and operations of thismachine as a part of the operation of bending one end of the strippedlead.

With the foregoing and other objects in view,

I have devised the construction illustrated in the accompanying drawingsforming a part of this specification. It is, however, to be understoodthe invention is not limited to the specific details of construction andarrangement shown, but may embody various changes and modificationswithin the scope of the invention.

In these drawings:

Fig. 1 is a front elevation of the machine with parts broken away tomore clearly show the construction;

Fig. 2 is a sectional view along line 22 of Fig. 1 showing a top planview of a cam for controlling the opening and closing of the wire feedfingers and connected parts;

Fig. 3 is a partial section and partial side elevation showing the wirefeed fingers;

Fig. 3a shows these fingers in dotted lines in closed position;

Fig. 4 is a front elevation of the feed mechanism on a larger scale thanFig. 1 showing it in another position from that of Fig. 1, variousassociated parts being shown in section, this section beingsubstantially on line 4-? of Fig. 5;

Fig. 5 is a top plan view of the lead wire cuttin ofi and strippingmechanism;

Fig. 5a is a face view of a pair of the stripping knives in the closedposition;

Fig. 5b is a similar view showing the knives in the open or separatedposition;

Fig. 6 is a rear elevation of the main portions of the machine withtherear wall of the base frame or housing broken away to show thevarious cams and associated elements;

Fig. 7 is an elevational view looking from the right of Fig. 6 showingpart of an operatin shaft;

Fig. 8 is a top plan view of the feed cam;

Fig. 9 is a top plan view of the stripping cam and associated parts, aportion of the housing being shown in section;

Fig. 10 is a detail elevation of the mounting connection of certain ofthe parts looking from the right of Fig. 9;

Fig. 11 is a top plan view of the bending device showing how it isapplied to the machine frame;

Fig. 12 is a top plan View of a form-of bending device for bending ahook in the end of the lead wire, showing the jaws open, but after somemovement from the full open position;

Fig. 13 is a view of the front ends of the jaws showing them in the nextposition;

Fig. 14 is a similar view showing the jaws in the closed position;

Fig. 15 shows the jaws again open at the end of the cycle, just beforeremoval of the bent lead wire;

Fig. 16 is a side elevation looking from the right of Fig. 12;

Fig. 1'? is an end elevation looking toward the bottom of Fig. 12; v

Fig. 18 is a top plan view with the jaws removed;

Fig. 19 is a longitudinal section substantially on line |9-I9 of Fig.12;

Fig. 20 is a transverse section substantially on line 20-2ll of Fig. 12;

Fig. 21 is a transverse section substantially on line 2 l2l of Fig. 13;

Fig. 22 is a plan view of a bent end of the lead wire showing the openor hooked end;

Fig. 23 is a similar view showing the closed or eyelet loop;

Fig. 24 is a view similar to Fig. 12 showing a plan view of a modifiedarrangement of jaws for bending a complete loop or eyelet in thestripped end of the lead wire and showing the jaws in the open position.It also shows the stripped end of the lead wire in position for thebending operation;

Fig. 25 is a longitudinal section substantially on line 2525 of Fig. 24;

Fig. 26 is a top plan view of the jaws of Fig. 24 showing the nextposition;

Fig. 27 shows these jaws in the next position, and

Fig. 28 shows the jaws in the next position with a looped lead wire.

The machine comprises a base I onwhich is mounted the machine frame orhousing: 2. At the lower part of this frame is the main drive shaft 3(Figs. 1 and 6) operated by any suitable means such, for example, aselectric motor 4, and at the opposite end may be a hand wheel'5'topermit hand operation of the machine for setting up and adjustingpurposes. On the shaft 3 is a worm 8 meshing with the worm wheel]secured on the upright cam shaft 8 for driving it, and secured on thisshaft are the various operating cams comprising the feed cam 9, the camIn for.

shifting the wire grippin means for performing the stripping operations,the cam II for operating the cutting-off and stripping slides, and thecam I2 for controlling the opening and closing of the'gripping'fingersfor the stripping and feeding operations. Cams I9 and I I are combinedon one member I 3, cam IO'bein cut in the top of this member and the camII in the under side thereof. Also mounted in the frame but located toone side of the shaft Bis an upright intermediate or pilot shaft I4forming supports and pivots for certain of the arms and levers operatedby cer tain of these cams.

The feed operating cam'9 (Figs. 6 and 8) includes a cam groove- I5 'inwhich runs'the roller I6 on a lever arm I! pivoted at I8 to a bracket E9on themachine frame; and adjustably mounted on this-lever arm is a block28 to which is pivotally connected a link 2| pivotally connected at 2Iato a feed'arm 22' (Fig. 9) pivoted at 23 on an oifset=lever 24, pivotedat 25 to the bracket arm 29 mounted on the machine frame. The outer end"of thisoifset lever is pivotally connected-at 21 to a'link 2B'pivotedat29 to an arm 30 of the bell crank lever 3| pivoted to turn freely on'thepilot shaft I 4, the other arm 32 carrying the roller 33 running in thecam slot 34 of "the cam'IO. On the front upper part of the machine is ahorizontal guide 35 on which is mounted the head 36;(Fi'gs. 1 and 4) forlongitudinal sliding movement; this head being adjustably connected at38 through the rod or link 31 to the other end of the feed arm 22 forsliding this head 36 in certain timed relation by the action of cams 9and 'I 0 "(Figs: 6, 8 and 9) as willbe -more fully described later. Thearm 22 comprises two members 22a (Fig. arranged in a sort of V, and

48islidable on a square shaft 41 with the head arm carries a roller 51running in a cam slot 58 in the finger control cam I2 (Figs. 1, 2 and6).

Mounted on the front of the machine frame is the lead wire cutting andstripping device 59 (Figs. 1, 4 and 5). This comprises a bracket or base60 in which is mounted a pair of slides 6| and 62 movable horizontallytoward and from each .other and'carrying the lead wire cutting-offknives 65 and 66, and stripping knives 63 and 84,

.and 8! and 68, these knives being arranged in pairs opposed to eachother as shown in Fig. 5, and with the knives 63, 65 and 61 carried bythe slide 62; and the knives 64, 66 and 68 carried by the 1 slide. 6|.These knives have opposed V- shapedknife edge cutting ends, as shown inFigs. 5a and 5b, the edges 61a and 88a of knives 81 and 68* only beingshown in these figures. Slide 62 is operated by an arm 69 pivoted toturn on the shaft I4 and carrying a roller I8 running in a cam groove IIin cam. II. The slide 62 is connectedztoslid-efifil :by a bar I2 havinga rack I3 meshing withan intermediate pinion I4 meshing on:itsi oppositeside-with a'rack I5 on the slide 6|, the pinionbeing on a shaft I6mounted in the bracket 69. It will be understood with. this arrangementthe slides BI and 62 are connected together to move simultaneously inopposite directions; so that when the slide 62 is moved inwardly towardthe wire 49 by the cam operated arm 89, the slide 8| will besimultaneously shiftedtoward the wire from theopposite side. Similarly,when operated in the opposite direction they'will move awayfrom the wiresimultaneously.

The bending device is indicated as a whole by thenumeral I1 (Figs. 1, 4,and 11 to 21) and is mounted by'a bracket 18 through an arm 19 on theframe 2 of the machine by any suitable means, such as thescrewsor bolts(Fig, 11). The bracket includes a forward horizontal guide arm 8| havingon its front wall a T-rib 82 forming a slide and guide support for thebase block 83 of the bending device, the inner edge of the block83-being provided with a similarly shaped slot running. on the T-rib orguide. On the top of this block 83 are laterally spaced overhangingsideflanges Hand 86 (Figs. 17, 18 and 20) forming guides for the oppositeedges of a sliding -plate:8'l; provided at one end with an upstandingblock orlug 88. This could be integral with theplate, or as in thestructure shown, could be a separate member secured to the plate by anysuitable means, such as the screws 89. Pivoted on thetopof the slideplate 81 is a pair of levers 98 and 9| carrying at their forward endsbending jaws 92 and 93 opposed to each other, the pivots being shown at94.

Thebase 83 is provided with a pair of laterally spaced longitudinalslots 95 (Figs. 12, 18 and 21) the main portions of which aresubstantially parallel and each having at its forward end an inclinedportion 99, these portions inclining outwardly in oppositedirections, asshown in Figs. 12 and 18. In these slots are operating pins or rollers91 for the levers 99 and 9| and the jaws carried thereby, and theunderside of the base 831s provided with elongated recesses 98 followingthe slots 95 and 96 to receivethe heads 99 0f these pins. These pinspass through openings 812) (Fig. 21) in the slide 81 large enough topermit the necessary lateral movement of the pins and areseated inopenings I00 in the levers 99 and 9|. The jaw 92 is a horizontallyprojecting rounded rib formed as part of block IGI which is'secured tothe lever 98 by any suitable means, such as the block or'plateI02'fastened by the screws I03. The jaw 93 is formed as part of asimilar block I04 held in a recess in the lever 9| by plate I05 securedby the screws I06. Jaw 93 comprises a horizontally projecting ribrounded on the rear or inner side toward the jaw 92, and the jaw 93 asshown in Figs. 12 and 15 is arranged with the ofiset side forwardly ofthe end of the jaw or rib 92 a distance equal to about the thickness ofthe stripped wire 40?).

Mounted for sliding movement in the lever 9i is a slide I07, this slidebeing mounted by means of a T-shaped rib I08 (Figs. 20 and 21) runningin a similarly shaped groove in the side of the lever. It is normallyheld in the retracted position of Fig. 12 by means of a spring I09seated at its opposite ends in recesses in the slide I01 and the blockI04 of the jaw 93. This slide has an offset end or extension H in theform of a straight lug for a purpose presently to be described. The base83 is provided with a longitudinal slot I I I in its top wall in whichis mounted a key H2 extending through slot 81a in plate 8'! foroperating the slide 101, this key having a lug M3 on its upper edgeseating in a notch in the under side of slide i0'i. Stop pins H4 and H5suitably spaced in this slot form limit stops for movement of the key H2and the slide I01, and stop H5 acts as a means to retract slide I01 incase of failure of spring I09.

Movement of the block 83 on the guide 82 is determined by an adjustablestop formed by the end II6a of a bar II6 mounted on the front of theguide 82 and adjustable longitudinally thereon by a clamping screw II!in an elongated slot H8 in the stop. A spring [I9 (Fig. 1) connected tothe lug or block 88 by having its ends passing through an opening I20 inthe block and secured at its other end to the bracket 69 tends to shiftthis whole device to the left as viewed in Fig. 1, or downwardly asviewed in Fig. 12 for the reverse or return movements. The jaw block IOIis provided with a recess I2I in which is a release or stripper memberI22 at the inner side of the jaw 92. It is mounted on a rod 123 slidablein the block I92 and is embraced by a spring I24 which tends to move itoutwardly or downwardly as viewed in Fig. 12, and mounted on the base 83is a stop I26 adapted to be engaged by the end of the rod I23 at the endof the outward or reverse movement of the slide plate 8'! to push thisrod and the stripper I22 inwardly to release the bent wire from the jaw92 at the end of the cycle, as will presently be described.

The operation is as follows:

We will assume that the insulated wire 49 (Figs. 1, 4 and 5) has beendrawn from the supply spool or reel I26 and a lead of proper length hasbeen cut off and bent and discharged from the machine. The end of thewire is then against the cut-off knives 65 and 66 of Fig. 5. The fingergrips 43 are to the left of these knives, as indicated in dotted lines43a (Fig. 4) and it will be seen that in this position, as shown in Fig.5, the forward end portion 490 of the insulation is between the cut-offknives 65 and 66 and the stripper knives 63, 64. The stripper knives 63,64 and 61, 58 are set so as to move just far enough to cut through theinsulation but not to cut the metal wire, as shown in Fig. 5a. The camI2 by operating the square shaft 41 clamps these fingers 43 onto thewire so as to grip it. Now the cam I9 shifts the offset lever 24 (Fig.9) through the bell crank 31 by swinging the arm 32 inwardly as viewedin Fig. 9, which thus throws the pivot 23 of the feed arm 22 outwardlyor to the right as viewed in Fig.9. This swings this arm 22 about thecon.-

nection 2Ia which is a pivotal connection to the link 2I which is nowstationary, and thus swings the free end of the lever arm 22 to the leftas viewed in Fig. 9. This action, through the rod 37, shifts the head 36and the fingers 43 a short distance to the left from the dotted position43a to the dotted line position 43b Fig. 4. This movement carries thewire 40 with the fingers 43 stripping the length 400 of the insulationfrom the end of the wire, which is the short end of this wire.

At this time feed cam 9 operates the feed arm 22 to the right, as viewedin Figs. 1 and 4, and the cam II through the arm 69 shifts the blocks BIand 62 outwardly to separate the cutter and stripper blades, whichpermits the fingers 43 gripping the wire 40 to pass to the right betweenthese blades to the full line position 430 of Fig. 4. This action of thegripping fingers, of course, carries with them the wire with thestripped end 40b, and now the cam II shifts the blocks 6|, 62 in theopposite direction to close the stripping and cut-off blades to theposition of Fig. 5. In this action the cut-off blades 65, 66 cut off thelength of lead wire 46a, the blades 63 and 64 cut the insulation to theleft of these blades, as above described, while the blades 61 and 68 cutthe insulation at the proper distance to be stripped from the rear endof the cut off length 40a, this length being shown at 40d. After thisaction the cam I0 shifts the offset lever 24 (Fig. 9) to the left aboutits pivot 25 Or toward the front of the machine, swinging the pivot 23to the left as viewed in Fig. 9, thereby swinging the free end of thearm 22 to the right (link 2| and pivot 2Ia being stationary) and throughthe rod 31 shifts the head 36 and the fingers 43' to the right to thedotted line position 43d in Fig. 4. This will strip the insulation 4001(Fig. 5) from the rear end of the cut-off lead 40a.

At the beginning of this stripping action the forward stripping end 20bis in position to be formed between the jaws 92, 93 (Fig. 12). As thehead 36 carrying the gripping fingers 43 moves forwardly for thisstripping action, a stop lug or arm I21 (Figs. 1, 4, 12, 16 and 19) hitsthe head or lug 88 of the bending device, as shown in Fig. 4, andtherefore carries this lug and the slide plate 81 and the bending jawscarried by this plate along with it to the dotted line position 88a.This is also the position of Figs. 14 and 19. Movement of the base 83 isprevented by the adjustable stop member H6, and this stop member can beadjusted to position the base 83 and therefore the bending device at theproper position to start this movement of plate 81 at the proper timewith the' head 36. As previously stated, when this movement of the plate6'! starts, the stripped end 40b of the insulated cut-off lead 40a isinserted between the bending jaws 92 and 93, and as the plate 61together with these jaws now moves forwardly at the same speed as thehead 36 and the fingers 43 carrying this cut-off strip 40a, it remainsin this relative position with respect to these jaws. During the firstpart of this forward movement, the rollers or pins 91 move along theinclined portions 96 of the slots 95 and by swinging the levers and 9I,move the jaws 92 and 93 inwardly toward each other against the oppositesides of the stripped wire 4% to the position of Fig. 13. It will beseen that in this position the jaw 93 has bent the free end of the wirearound the edge of the jaw 92 through an angle of about 90, and theinsulation on the lead 40a-hasbeen gripped by the inner side-surfaces92a and 93a (see Fig. 12) of thejaws soas to hold. the wire in properposition in the. jaws.

It will be seen from Fig. 13 that in this position the free end of thestripped portion 40b is in alignment with the offset lug or extension II on the slide I01. At this point the key I I2. (Fig. 19) engages thestop II4', which therefore prevents further movement of. the'slide I 01fore wardly with the plate 81 and the bending. jaws. As the plate 81 andthe jaws continue to. move forwardly, the motion of key I I2 and theslide I0! is therefore'stopped and continued movement'of the jaws'withthe wire carries them to theposition of Fig. 14. As it moves tothis position the free end of the wire hits the end of the extension H0and it is bent'to the hooked position of Fig. 14. This completes thebending, of the hook in the stripped end ofthe wire and is thepositionof Figs. 14 and 19. This movement also, as previously indicated,completes the stripping of the portion of insulation 40dfrom the rear orleft hand end of the cut-off lead 40a. Cam I2: now opensthe feed jaws 39and feed cam'9 operates to swing the free end of the feed arm 22 to theleft or in the return direction and the spring II9 (Fig. 1) moves the.slide 8! and the bending jaws backwardly or to the left, until at theend of this movement the end of the stripper rod I23'hits the stop I25pushing the stripper I22- forwardly, as shown in Fig. 15, to release thebent endof the wire from the jaw 92." In moving to this position thepins or rollers 91 have moved back into the inclined slots 96 and haveopened the jaws for the. next operation. This releases the bent cut-offlead from the jaws, and as at this time the cam I2 has operated thesquare rod 41 toopenthe clamping fingers 43, as shown in dotted lines at43e (Fig. 3), the cut and stripped lead with the bent end drops from themachine. Continued movement to the left of the head 36- under actionof'the feed cam 9 and the feed arm 22, and with these fingers 43 in theopen position, carries them between the cut-off and stripping knives63to68 to the dottedv line position 43a of Fig. 4, in preparation'for thenext feeding and stripping operation, after which the cycle is repeated.The fingers are closed onto the wire 40, it is shifted to the left tostrip the forward end 400, and then it is fed forwardly for thecutting-off, stripping and bending actions, as described.

Briefly then, the operation is: the fingers grip the wire, shift it ashort distance to the left to strip the forward or short end, then thesegripping fingers are advanced through the open knives to feed the wirethe proper length'required. Then the knives close to cut off this lengthand at this time the forward end which has already been stripped hasbeen inserted between the bending jaws, but movement of the bendingdevice at thispoint has not started; Then further movement of the head36 with the gripping fingers advances the cut off wire for the strippingof the rear end of this cut off lead and at the same time moves the jawsof the bending device forwardly with the head 36 and the cut off wire,which movement operates the jaws to bend the forward stripped end" ofthe .wire to form the hooked end 40f, as shown in Fig. 22. Then the-head36 and associated parts are shifted to the left or in the reversedirection, permitting the bending jaws to be shifted to the normal andopen position by the spring I I9; releasing the bent and cutoff leadandmov ing the parts to positions for starting the cycle '8 all overagain- Feedjaws 39 are opened attho beginning of the left hand or.reverse motion and the hooked lead is ejected when the jawsof thebending device are opened.

In the form of the device of Figs. 12 to 21, the end of the wire is bentto a hook shape, as shown in Fig. 22. However; it may be desirable tobend it'to a complete loop or eyelet, as indicated at 409 (Fig. 23). Abending device modified to securethis result is shown in Figs. 24 to 28.In this device the base I28 corresponds to the base 83 of the devices ofFigs. 12 to 21, and has similar overhanging side flanges I29 formingguides for the opposite edges of the movable sliding plate I30corresponding to plate 81 of the first form. Secured to the forwardendof this plate is the same upstanding operating lug or head 88 forshifting this plate and'the jaws during the bending operation. Pivotallymounted on the plate I30 by the pivots I3I are the levers I32 and I33carrying at their free ends the bending jaws I34 and I35, these jawsboth being concave jaws, as shown in Fig. 24, and substantiallysemi-circular in shape, although the jaw I35 is provided with a recessI38 extending inwardly-from the end to about half the concave portion onthe level with and to receive the lead wire 46a being bent. Betweenthe'two jaws I34-and I35 is a slidable pin I3'I about which the strippedend of the wire is bent to form the loop or eyelet. This is slidablevertically in an opening in the plate or slide I30, and when the jawsare open it is in the lower or retracted position below the jaws I34 andI35, as shown in full lines in Fig.

" 25, it being shifted to and normally held in this position byspringI38. It is shifted to its upper or dotted line position with its upperend between the'jaws I34 and I35 during thebending operation by slidingits head I3Ia on the inclined cam surface I39 formed in the base I28.This base is also provided with two longitudinal slots for operatingthe'bending jaws. The roller orpin I40 in the lever I32 projects into aslot in the base I28 comprising a straight longitudinal portion MI andat its forward end an inwardly inclined portion I42. A roller or pin I43in the lever I33-runs in aslot in the base I28 comprising a longitudinalstraight portion I44 and a rearwardly and outwardly inclined forward.end portion I45. Also mounted in the lever I33 is a slide I46 having aT-rib I 41 running in a similarly shaped guide I48 on the inner edge ofthe lever I33. This slide may move longitudinally of lever I 33 and isnotched at its rearward end portion as indicated at I49 to provide areduced offset end or extension I50 similar. to the extension IIO of thefirst form, except that it is considerably longer and is provided withav rectangular opening I5I. This slide I48 is operated by a-key I52running in a longitudinal groove I53 in the base block I28 and itoperates between two stop pins I54- and I55 projecting into this groove.A'lug I56 on the upper'edge of this key seats in a similar recessin theunder side of the slide 46 for operating it.

In operation, this device goes through the same cycle and series ofoperations with the feeding head 36 of'the machine as the device ofFigs. 12 to 21; that is, on the forward movement of the head 36 and thefingers 43 to feed the length of lead 40a to be cutoff, the strippedforward end 401) isinserted between the jaws I34 and I35,..as shown inFig.1 24. At this point, which is the beginning'of thestripping'operatlonzfor the rear end 4011 of the cut on lead length,the-lug I21 on 'head 36 engages the head or block 88, and during thisstripping movement of the cut off lead 400. it shifts the slide I30 tocarry it along with this head 36, the same as described in connectionwith the device of Figs. 12 to 20. During the first part of thismovement the cam I39 shifts pin I31 upwardly to the dotted line positionof Fig. 25 and to its position betweenthe jaws I34 and I35. During thefirst part of this movement, as the roller or pin I40 of lever I32 is inthe straight portion I4I of the slot in the base block I28, the jaw I34does not move inwardly, but as roller or pin I43 of lever I33 is in theinclined portion of its operating slot, the jaw I35 is' shifted inwardlyto the position of Fig. 26. During this movement the slide I46 retainsits same position with respect to the lever I33 and the parts are now inthe position of Fig. 26. During this movement the jaw I35 has bent thefree end 40b of the wire through a right angle about the pin I31 withits free end in alignment with the end of the extension I50. At thispoint the forward end of the key I52 engages the stop I54 so thatfurther movement of the slide I46 with the slide plate I30 is arrested.Therefore, as the plate I30 and the swinging jaws I34 and I35 carried byit continue to move forwardly, the slide I46 remains stationary and thepin I31 and jaw I35 are carried beyond the free end I50 of the slide tothe position of Fig. 27. The jaw I35 and pin I31 are now opposite theopening II through the extension I50. In this movement the extension I50has bent the free end of the wire another 90 about the pin I31, asindicated in Fig. 27. During this movement the roller or pin I43 ismoving in the straight longitudinal slot I44 to maintain the jaw I35stationary and hold the wire on the pin I31. Continued movement of theslide plate I30 forwardly now carries the roller or pin I40 of the leverI32 into the inclined portion I42 of its operating slot, and by cammingaction of this slot the free end of the lever is swung inwardly carryingthe concave jaw I34 to the position of Fig. 28. During this movement theprojecting concave jaw I34 is carried through the opening I5I in theextension I50 and completes the bending of the free end of the wireabout the pin I31 to complete the closed loop or eyelet shown at 409 inFig. 23. On reverse movement, or movement to the left, of the feed head36, this operation is reversed, the slide plate-I30 with the partscarried thereby being shifted back to its normal position of Fig. 24 bythe spring II9, the same as in the first form. During this movement, therear end of the key I52 engages the stop I55 and shifts the slide I46back to its position of Fig. 24. Also, at the end of this reversemovement the head of the pin I31 slides down the cam surface I39,permitting spring I38 to retract this pin out of the loop in the wire,thus releasing this wire and the cut off lead so that it drops from themachine and the device is ready to receive the stripped end of the nextcut off lead, and the cycle is repeated. Other means could be used tooperate this pin.

Thus it will be seen from the above that the movements and operations ofthe wire out 013 and stripping machine are employed to operate thisbending device, this device really becoming a part of the cut off andstripping machine and operates as an integral part of it, and indefinite timed and synchronized movement with the movements andoperations of this machine, so that now the machine automaticallyperforms the complete operations of cutting off the lead wire to length,stripping the insulation from pre determined portions of the oppositeends of the cut off length, and then bending the stripped lead at oneend to a loop, either an open hooked loop or a closed loop or eyelet.The bending device, however, may be assembled as a distinct unit andapplied to cut-off and stripping machines already installed, employingparts and motions of these machines for its operation.

The means described for operating the slides, levers and jaws of thebending device are one effective way of operating them, but it will beunderstood other operating means may be employed.

An additional advantage to the automatic operation of this device isthat the ends of all 'of the leads are bent uniformly, greatlyfacilitating the assembly of the leads in the electrical devices. Thisis not true where the ends are bent by hand, as with hand operationthere is considerable variation in the bent ends. Throughout thespecification and claims where the term loop is employed it is intendedto include either the open or hooked form of the loop or the closedloop, unless otherwise particularly stated.

Having thus set forth the nature of my invention, I claim:

1. In a machine for preparing electrical conductor leads comprisingmeans for stripping the insulation from the free end portion of aninsulated lead wire, means for feeding the wire forward a given amountto determine the length of the lead, means for cutting off the advancedlead to length, and means for advancing the cutoff lead longitudinally,bending jaws arranged to receive the stripped forward end of the wire asit is shifted to the cut off position by the feeding means, and meansfor operating the jaws during advancing movement of the cut off lead tobend a loop in the stripped end of the wire.

2. In a machine for preparing electrical conductor leads comprisingmeans for stripping the insulation from the free end portion of aninsulated lead wire, means for feeding the wire for ward a given amountto determine the length of the lead, means for cutting off the advancedlead to length, and forwardly movable means for advancing the cut offlead longitudinally, bending means arranged to receive the strippedforward end of the wire as it is fed forwardly and capable of bending aloop in said wire end, and means operated by forward movement of thelead advancing means for operating the bending means.

3. In a machine for preparing electrica] conductor leads comprisingmeans for stripping the insulation from a free end portion of aninsulated lead wire, and forwardly movable means 'for advancing thestripped wire longitudinally, bending means arranged to receive thestripped end of the wire as it is advanced by said means and capable ofbending a loop in said wire end, and means operated by further forwardmovement of the wire advancing means for operating the bending means. i

4. In a machine for preparing electrical conductor leads, means forstripping the insulation from a free end portion of an insulated wireincluding a movable member, means for bending a loop in the stripped endof the wire including a base member, a slide slidable on the basemember, a pair of laterally movable jaws on said slide capable ofcooperating to bend the end of the wire, cooperating means on the baseand slide to operate the jaws by movement of the slide, and

nleans operated by the movable member to shift the slide to operate thejaws to bend the wire.

"5. In a machine for preparing electrical conductor leads, means forstripping the insulation .froma free end portion of an insulated wireineluding a movable member, means for bending 'basemember provided withcam means, a movableslide on said base, opposedjaws on the slidearranged to grip opposite sides of the wire to form the loop, means onthe slide cooperating with the cam means to shift at least one jaw togrip the wire by movement of the slide, and means operable by saidmovable member to shift the slide.

7. In a machine for preparing electrical conductor leads, a base member,a movable slide mounted on said member, means on the slide for bendingthe stripped end portion of an insulated wire to form a loop comprisinga pair of pivoted levers mounted on the slide, opposed bending jawscarried by said levers, said base being provided with cam slots, meanscarried by the slide running in the slots and connected with the leversfor operation by movement of the slide to operate the levers to bend thewire through substantially a right angle about one jaw, a second slidemounted on one lever and provided with an extension at one end movableagainst said bent end to bend it further about the jaw, a. lost motionconnection between the second slide and the base including a stop tolimit movement of the second slide relative to the base, and means forshifting the first slide to operate the jaws-and the second slide.

8. In a machine for preparing electrical;conductor leads, a base member,a movable slide .mounted on said member, means on the slide forbendingthe stripped end portion of an insulated wire to form a loop comprisinga pair of l opposed jaws pivoted to the slide to move toward and fromeach other, said base being provided with cam slots, means in the slotsand connected with the jaws for operating them by movement of the slideto bend a wire about one jaw, a stripping member mounted on a rodslidable in the latter jaw and located in alignment with the bent loop,means for shifting the slide in one direction to close the jaws to bendthe loop and to shift the slide in the reverse direction to open thejaws, and stop means to engage the rod at the end of the reversemovement to shift the stripping member to release the bent loop from thejaw.

9. In a machine for preparing electrical conductor leads, a base member,a movable slide .mounted on said member, means on the slide for bendingthe stripped end portion of an. insulated wire to form a loop includingopposed laterally movable jaws, a slidablepin locatedbetween the jaws,cam means in the base, anoperativeconnecting means from the cam means toshift .one

'of the jaws to bend the wire to approximately a right angle around saidpin, a second slide having .lost motion connectionwith 'the base andprovided with an extension movable between the jaws to engage said bentend of thewire and bend it through approximately a further right angleabout the pin, said extension being provided with an opening through itin alignment with the pin after the second bending operation, the otherjaw being a concave jaw movable through said opening to bend the freeend of the bent wire further about the pin, a second cam means in thebase, an operative connection from the latter cam'means to thesecondjaw, means for shifting the first slide to operate the jaws andsecond slide, and means for withdrawing the pin from the loop at the endof the bending operation.

'10. In a machine for preparing electrical conductor leads, meansforstripping the insulation from the free forward end ,portionof aninsulated lead wire, forwardly movable means for feeding the insulatedwire forward a given amount to determine the length of the lead, meansfor cutting off the lead at a distance from said stripped end,meansforwardly of the feeding means for bending a loop in the strippedend of the wire arranged to receive said end on a forward movement ofthe wire by the feeding means, and means operated by further forwardmovement of the feeding means .for operating the bending means.

11. In a machinefor preparing electrical conductor leads, meansforstripping the insulation from the free end portion of an insulated wirelead, forwardly movable means for feeding the insulated lead wireforward a given amount to determinethe length of the lead, means for.cutting off the lead to length, movable jaws capable of bending thestripped end of the wire between them to form a loop, means foroperating the feeding means forwardly to insert the stripped end of thelead in said. jaws, and means operated by furtherforward movement of thefeeding means to operatethe jaws to form the loop.

l'2.,.In.a machine for preparing electrical conductor leads, meansoperable by longitudinal movement of an insulated lead wire for strip-.ping a portion of .the insulation from the free end of the wire,forwardly movable means for feeding the insulated lead wire forwardagiven amount to determine the length of the lead, means for cutting offthe lead tolength, means for bending thestripped endportion of the leadinto .ailoop, means for operating the feeding means to carry thestripped .end to the bending means, and means operated by furthermovement of the feeding means for operating the bending means.

13. In a machine for preparing electrical conductor leads. comprisingmeans for stripping the insulation from the free end portion of .aninsulated lead wire, forwardly movable. means for feeding the wireforward a given. amount to determine the length of thelead, means forcutting off the advancedjleadto length backwardly from the stripped end,and means for shifting the ,feeding meansto advance the out off leadlongitudinally, means for bending aloop in the stripped end of the wirearranged to receive the stripped end as thecut off lead is advanced, andmeans operated by further movement of the leadadvancing .meansforoperating the bending means.

.14. .In amachinefor preparing electrical con- ..ductor leads, .means.'for holding and cutting a portion of the insulation at a free endportion of an insulated lead wire, longitudinally movable feeding meansfor shifting the wire backward to strip the cut insulation from thewire, means for bending a loop in the stripped end of the wire, saidfeeding means arranged to shift the wire forward to insert the strippedend in the bending means, means operated by forward movement of thefeeding means for operating the bending means, and a main driving meansfor operating the stripping means and the operating means for thebending means.

15. In a machine for preparing electrical conductor leads, means forstripping the insulation from a free end portion of an insulated wireincluding a forwardly movable member, means for bending a loop in thestripped end of the wire, means movable with said member for feeding thewire forwardly and inserting the stripped end in the bending means, andmeans operated by further forward movement of said member for operatingthe bending means.

16. In a machine for preparing electrical conductor leads, means forstripping the insulation from a free end portion of an insulated wireincluding a forwardly movable member, means for bending a loop in thestripped end of the wire comprising movable jaws to grip opposite sidesof the wire, means movable with said member for feeding the wireforwardly and inserting the stripped end into said jaws, and meansoperated by further forward movement of said movable member to operatesaid jaws to bend the wire.

17. In a machine for preparing electrical cn ductor leads, means forstripping the insulation from a free end portion of an insulated wireincluding a movable member, a base member, a movable slide mounted onsaid member, means mounted on the slide and movable therewith forbending the stripped end portion of an insulated wire to form a loop,cooperating means on the slide and base operated by movement of theslide on the base for operating said bending means, and means operableby said movable member for shifting the slide to operate the bendingmeans.

18. In a machine for preparing electrical conductor leads, a basemember, a movable slide mounted on said member, means mounted on theslide and movable therewith for bending the stripped end portion of aninsulated wire to form a loop including opposed jaws at least one ofwhich is movable, means for feeding the stripped end of a lead into aposition between said jaws including a movable member, said base beingprovided with a cam slot, an operating means connected to the movablejaw and running in said slot, and means operable by the movable memberfor shifting the slide to operate the jaw through said operating meansand slot.

19. In a machine for preparing electrical conductor leads, a basemember, a movable slide mounted on said member, means on the slide forbending the stripped end portion of an insulated wire to form a loopcomprising a pair of opposed jaws pivoted to the slide to move towardand from each other, means for feeding the stripped end of a lead into aposition between the jaws including a movable member, said base beingprovided with cam slots, means in the slots and connected with the jawsfor operating them by movement of the slide to bend a wire between them,and means operable by the movable member for shifting the slide tooperate the jaws.

JOHN VOLLMER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 155,657 Lewis Oct. 6, 1874375,577 Short Dec. 27, 1987 383,084 Wilder May 15, 1888 418,512 GriswoldDec. 31, 1889 592,727 Frantz Oct. 26, 1897 1,262,334 Handke Apr. 9, 19181,304,780 Kepler May 27, 1919 1,581,105 DIncognito Apr. 20, 19261,733,294 Cross Oct. 29, 1929 1,787,658 Andren Jan. 6, 1931 1,828,413Holmes Oct. 20, 1931 2,393,364 Goldfield Jan. 22, 1946 2,434,591Schaefer Jan. 13, 1948 FOREIGN PATENTS Number Country Date I 28,387Great Britain Dec. 24, 1903

